01-05-2010 07:28 AM
(Please note that with Vista there are correctly reported and used 4 GB)
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01-06-2010 12:45 AM
If you want to access all 4GB of RAM, you'll have to install a 64 bit OS. You should also be aware that the performance gain between 3 1/2 GB and 4 GB of RAM is practically impossible to notice at all. To make any difference, you'll need not only a 64 bit OS, but at least 6GB of RAM *AND* programs that are written to access that much RAM.
The difference in multitasking between 3 1/2 GB of RAM and 4 GB of RAM will be negligible.